Q1 Head in the CloudsGiraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length.This neck enables a giraffe to access food that other animals cannot reach and detectpredators from a long distance. Studies have shown that giraffes will browse trees at heightsthat other herbivores cannot reach. The water and nutrients gained from leaves enhance agiraffe's fitness by increasing survival and reproduction. However, a long neck comes with acost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were toolong, the energy required to circulate blood would exceed the energy gained from eating leaves.1. In a population of giraffes, the average length of the neck is under stabilizing selection.TrueFalse

True A extremely short neck makes feeding difficult, whereas a very long neck increases the energy…

Answered: 1. In a population of giraffes, the…

Science

Biology

1. In a population of giraffes, the average length of the neck is under stabilizing selection. O True O False

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter21: Microevolution: Genetic Changes Within Populations

Section: Chapter Questions

Problem 1ITD: Peter and Rosemary Grant of Princeton University have studied the ecology and evolution of finches...

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Concept explainers

Genetic Variation

Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.

Quantitative Genetics

Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.

Question

Head in the Clouds
Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length.
This neck enables a giraffe to access food that other animals cannot reach and detect
predators from a long distance. Studies have shown that giraffes will browse trees at heights
that other herbivores cannot reach. The water and nutrients gained from leaves enhance a
giraffe's fitness by increasing survival and reproduction. However, a long neck comes with a
cost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were too
long, the energy required to circulate blood would exceed the energy gained from eating leaves.
1. In a population of giraffes, the average length of the neck is under stabilizing selection.
True
False

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